The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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atomic unit of electric quadrupole moment
 $ea_0^2$
 Value  4.486 551 484 x 10-40 C m2
 Standard uncertainty  0.000 000 028 x 10-40 C m2
  Relative standard uncertainty   6.2 x 10-9
 Concise form  4.486 551 484(28) x 10-40 C m2    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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